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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f884abd4d7ecb2f69ff9e32827804cc178fef198e8bd464997fa78fbb2887ca' 
  AND token = '/K2hHDIN7+DxtFgM5nbqEo8m4l9K0Ib5z2xx+/f5NA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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