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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7d9a3b0e55fbc34e01f37bf86ff76e4f49eb54c97225e9030e962b25062837' 
  AND token = 'XBm4zhibupaV4fvSVaM6NwtpG5imN7hLUjabN1EeEfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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