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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4d4b377f26aa0cb00d78e76d44b09f6089a97e8138d22b9a0a358b7c4c49fe' 
  AND token = 'vPAeGOJdj7nthzMNufCBLCY7h7Et5U/Ws2LH0129sRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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