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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2771575fb9853834756f0633be2448db8de6fc2f68a627dee4322f6e0dc3030' 
  AND token = 'xsEdyLHs/iFOiCs3/OIhQetCGKep91aw59xWDLeVXU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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