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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3334fc29e13390a9fc1c116fe6d44cb3c5f10bc99b5ed797ff6672f7f0b11d84' 
  AND token = '7JUul6gwkl6sN74L/X81YyIC0DxNpa4xOE/SgwlpnLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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