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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e89c5480d6beaf641f83227fe120962af5cf7eb1ee3a893d96c9648c4c1ffc2' 
  AND token = '0Dhd8AMMTF87xYdFabfkHLYKrEKstEOz8R5wO4f10Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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