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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5825318bff9c1208cb893cf41498a2dc31269b6a435751732ca9936632ee8dfd' 
  AND token = '0HNrguVmo+vN4yRZdT0N11BRGoiszgCeQfamo3p2/ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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