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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fec2e798d6d66dd4680386b80e178285fd4b3099793b22bcf5e78c11d68083' 
  AND token = 'XU+LEnbxuDDUxGjd9cfm8gMVErV8I6X5x6GgjQg9FFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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