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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a9ec2dc769b5b293fc24c426b1acb302cd656d6e6a58afa55b68d42c2cf08a' 
  AND token = 'nM6FXy9xjiFIssnoJ6++bBki1MMgMb4Gjxt2Le5kwUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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