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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f99eb77677a329808f75d0a87bb6921efe3f5062935c7268e7a1e695f4c3fc' 
  AND token = 'PbTEXVkUNtDsPPP32ZZffyQImK0fQAMFhPZRjdg+JgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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