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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cb604b7653ad6a637533e9774131ba8d855fbd1a09834b7ed2af45b636c0db' 
  AND token = 'Q+MMOBJNdhxOxRrD8jcAanQy/yuNX4Se/giJWCDqBdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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