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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a51ef479e505d2ccdfbce2277db1bbebef1f7ab89f0ab04347647d59a40b49' 
  AND token = 'Sc0R4Czr5ehgnbCXnwQH6ecEZhJyLDEiXQ4nR6/Wks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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