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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b777d63db131af483126a0a8e31d5d8721d9506b872abd9c6a518af713f73ac9' 
  AND token = 'nh1or++TXmO5jruknFKp7xaWyr02KY47BQeD7r3oXpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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