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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f50af3897c4520c3df42324d8e5ec0c80af55bebb5984ce28188a7a490d4e2' 
  AND token = 'SAqvdQpcEEboPs70u+K9J/Z4wdu1QFRthcPNBRsOSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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