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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98f9f06ba476a1012a1db0020d27f312340e60560bddae662827849007666c8' 
  AND token = 'cbHtS9QV5PYWckCwimkZGPjbA+kGQFMq0mZ5SAt40pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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