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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305873496931e095a628ec60c8bf6593f6f4226498fb527436a80baab4ea004b' 
  AND token = 'o8NUvdVtcQZyvHa+sRwi0aN1DS6bO6S2PaB1l7q3bdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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