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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40175a5de6dbf9c9851729852d484e1e8ae0f91772f95b630265ff7072b4f40a' 
  AND token = 'KeKIkXpdpHb8Ch9cJC/AhWrnMGdNTU64AO1TNcOI7Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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