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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e678a42f1e48c161a3013f36bcba9a6581bd9c21cb9e65bf01937889b2b7f832' 
  AND token = 'jGezI9EI7gNhFihklgjhrb+mRrIhWcqgj+zHrHiHEFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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