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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e287be9da74c901c931e77e5c430e837dd04c532b9c951e5127aaca21ac0cff9' 
  AND token = 'UwdL1jOjieZSc9wNoaPv9IZWkBfIPXkXT573T1JNLJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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