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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1e0503a0a4b6777ba7313c40b3fc8e025e00c88ba0558f5c87101c5d91b45a' 
  AND token = 'VIBBEIAtQfGODs6afPx2T1NgGKsZmC6ahCnMqrz9hXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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