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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c354f96d588dff868ef51ce5b70035854efc27087ca0b558cc2ae14313c1d1fc' 
  AND token = 'xfmT82hlMo+bqaFDoJIyi+duoxNk1MerI5GC+gbRxbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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