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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da06438b97fb26c44a226ee51db7d28e164cae5ebf1464270cfcb17aa1d0f14' 
  AND token = '7aglzK1VW44VwKlYdxkyfbWx7sYfUdeRMniBI0j1f78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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