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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2d660b4c4ef3c18ab3996f00459393d4a025f766a8557a43c53a32104226d' 
  AND token = 'pixuGxc4RM+NkJnjBRVes44tWWD29EtL2LJkxP1o9Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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