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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8850a516a9ede3ba91a67457cb4d2e656431833951f8f8b9d96deb73676802f' 
  AND token = 'Dd5T4LnaYWM5wxxxkqp5/Xbs6EV9Fj5uKOHBmY1aMPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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