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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a230a03dad8540d4b5607146360a8ca991adef206626ce5825a964e4912b1c' 
  AND token = 'KsC6kgBW3m9P9pzobiZco4g4ywKpi4Qe6rAsElGKQqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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