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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48eb73c1d1d465a2bb522f8ff330a9a8f738f51e0cfd43728977b897c505bf1' 
  AND token = 'PBdiEE7NrVetIdh2GGvLE3YZ8Gra5KS5pPd4nsO//JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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