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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dba1479262c73de02ab0cbdc5aa2788337806394e8ee364bcd1a3dac2425a3d' 
  AND token = 'TYfFqlm9gP5mR2aVIFeMtY2KLZ4DJ717TRJrwVlSY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}