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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec634139d883f2a1946fd08d5a3ccf2dfe3e08cb59b0efda5195c79e57f7fc2' 
  AND token = 'FcxjPfpkBn3XyuPbthx9REC97vLmpjbDqPfoqDVpt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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