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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d85b0b4cd9426cf9ca2376eeab1524d92a15bba9610fa42a9b05805690e2fa9' 
  AND token = 'wxwAhtCk41kVKq4h9b5d5tNdZHuoc1jVq8erf5/dMhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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