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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f389d5e331ad5cd86a85968bfaf8563d332b32ac34a1ab977dc59df3997054ac' 
  AND token = 'CDkf07Ees9at0OteOmDsDMVT6wmMV3V++V8lN3M6HBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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