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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4eb42ab4660498b7abed6725b98666786449bf3b0ceba68bdec5b0f69ecc9b' 
  AND token = 'sUGFBvFldQXlBcJKrnuoGdZeeDwfZ+mdfyzF/CQxr/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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