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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fa520269a3fb06769f86a7baf9e638b13fe6eb4fd2a5ace662f37ff78c5de1' 
  AND token = 'cuGHfxPyYsllOQ5NO1R5Q9ezdEvTJLVY8ZC4dg2LUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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