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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a113095766b26b3e8947def58fe23a1437f07f3d5862895ab4d8b1ea219461be' 
  AND token = 'h1bAqP1bb91i/00J7c74ULhn46xGZMlIYsm0x5SAo3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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