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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b9215a67819c91e62216550868381c625029781ac54e08b4ceec6c7dc0eab8' 
  AND token = 'C4UYw3qp4dPN0vg+slVABJlJ8a5STL3zI9DnC7AZ1jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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