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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa414fe65bb14f0d810a0620d35ab64fb9e0a45ebe858def1bd3ca131c8a31de' 
  AND token = 'Q6oM5lVfMxaz2/KF4ht5Yb8yVwGKdfNlby4Uc4uyab0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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