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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dc6e6834bcd6f28aea73f38e178efcc3e22ed814d630e3b4cbb0ad85ece10e' 
  AND token = 'Q9RX2pYggom+FOc8JWF5NP5K324dWmbl88pQjKvF/ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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