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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc6c641ff01beef8a22ca31350b3dac9bbf7f412848f4f790c53f3b1a36a8fc' 
  AND token = '7pqlUIf54hsHQfYtaU/xa+yXpLa2OPyqvTwu253gfss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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