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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfa261031c4c7c7709a573502257860fc5162f9300a486209b7f422a27191c2' 
  AND token = 'KaVrr4qjpMGsxk6r4aILtZtUMzSA2QCab2YV/xzzIjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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