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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebd9f78c8966e53cc474f92a73ea98b4932392b53c5d66fd339cc3031f36a0e' 
  AND token = '1GMBKwEYY5FSrVXl1T6RtxcWv87mc1Ka47i3gvREhVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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