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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2862e1d59b8e2142a741fdb9db58c9ab0fcd25e44b0c92bcddf2d77d7107833c' 
  AND token = 'O99xGv0UqC4SBHITmScy9gS5dCS13ZC4GQ3ac4FYj48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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