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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3633378b3edb1a0ee9cacd5ab2afefda4bb9d5f34e90db5a9ed357c0b0331312' 
  AND token = 'gmrrl8cqc/jefJN84uCR90xklEGgnqG+JD7P74FOZKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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