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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be436b9cec046decfa57ab84f77b4d60f8a4de96e365ae7dbcc92844ed733cfc' 
  AND token = 'mGr6HdarNkX6JkrMhnKosxe1YPDfqsHIttSElCPskkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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