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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619223866df140763e3121247ac3f464ed98fa1638a409181df0d6c4cce90b27' 
  AND token = '4DNBJZoeUGG2zOySf2w4So5HI2eW0RHEuSU3A15iqH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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