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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264d4f01f69efcd0c2f430fe48ed35fb02914e9fdc52284083967e48a6e96cc2' 
  AND token = 'GLyKgu6K/Q1+Ll6t32A6ptyZteCD4woo5am3sMUjK3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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