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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caac1b94404289ecb41b89dd52e9b6613a40f9912f302fee54c9f5f5fc93ae3' 
  AND token = '4VJKuvp1zG0HbnymSBwLjX/wtX9AO54BPIokrVRvKRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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