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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606a4a79194bcbf0be4b5ebe1c008ae997516ecb340aafb645e1f878fa2666e8' 
  AND token = '60m947uUbnL3rQD6tz2Acn4LXbYqyxFN+ABvhRl+CNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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