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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0538bb7188137b04f3518f44b379e55aa27bb99088f9e090b92c9f76c07070c3' 
  AND token = 'msB0ux7jLaCWOTvTJ4XXiCBpJvqUJEdmO+dOovOht/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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