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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ff6f0215ca873587d85fcf318b9c4018e45496a6916258b435ba75ddb28a3c' 
  AND token = 'v9YbVdF6c5TdTKy3Hu6S09Pw9DNaohwT4Pirrqcl5kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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