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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3108403bfcfc81eccf726c394a3f4e18f5c39897b2a7bce90312365e6dbb965f' 
  AND token = '6OYIL5WrcI8kvcBKPMaJJIq8r1sQXuL8m7ur493kOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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