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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c2ec38a0bce823fd2aae7745f597b4a66ae372e0a6963601d597e0c45b078c' 
  AND token = 'QmdHjn86pBoKNiMu1nxbhrwq42ZJy7HLnkLlq8fe8CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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