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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3533b508b334209d2db7f27b0e3157915e2602a56d5f5a2f7d4b51194f744c3e' 
  AND token = 'w70rSmigf5wYCR5OjCmTNawFNmVDqFy1W8plGmKnzHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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