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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7170da7625ad8cdfa26a851f769b0e085e680c2433f1121b0ded436dc636b59d' 
  AND token = '4zX7HgFlkD92NkZNe6JccFQ3qusAm2m5owoN2GJ+fJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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