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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb414c1c104d0b340e584e50508faa290215b915b0cfe8fe5f8fc683a81fa2a' 
  AND token = '/sH2tWyHsRs/aEKcMuWqxU0GPB5hyhKyoCMs3Ovla40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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