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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d52724755be88e1a856225e1f4b4c25880cca0eb14af06fbe26ea41fb31f7e' 
  AND token = 'zddRrh2dLaaqTtv9GaoCF4qq8Q6bzwRXlglJlNotRIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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